For a very specific response and look for the exact answer, if it is given - seek BlackMagic tech support. They will answer you in such a way that they perceive an imminent sale of their product. Would that not make sense from their point of view? Buyer beware.
Black Magic does not officially support VegasPro12 as an application. That is because the third-party aggreements with SCS were never reached officially beyond the period of release of the Version 9 of VegasPro.
The BM 4K camera has not been released, which is the reason no user has come back with answers. However if you want some guidance about "going 4K" then this is useful http://philipbloom.net/2013/05/28/4kraw/Phil Bloom on 4K[/link]